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CHEMICAL ENGINEERING (235 journals)            First | 1 2     

Showing 201 - 236 of 236 Journals sorted alphabetically
Nanochemistry Research     Open Access   (Followers: 1)
Natural Volatiles & Essential Oils     Open Access  
Noise Control Engineering Journal     Full-text available via subscription   (Followers: 4)
npj Science of Food     Open Access  
Ochrona Srodowiska i Zasobów Naturalnych : Environmental Protection and Natural Resources     Open Access  
Open Chemical Engineering Journal     Open Access  
Periodica Polytechnica Chemical Engineering     Open Access  
Petroleum Chemistry     Full-text available via subscription   (Followers: 1)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription  
Plasma     Open Access   (Followers: 3)
Plasma Processes and Polymers     Hybrid Journal   (Followers: 2)
Polymer     Hybrid Journal   (Followers: 86)
Polymer Bulletin     Hybrid Journal   (Followers: 6)
Polymer Composites     Hybrid Journal   (Followers: 18)
Polyolefins Journal     Open Access  
Powder Technology     Hybrid Journal   (Followers: 13)
Reaction Chemistry & Engineering     Hybrid Journal  
Reactions     Open Access  
Research on Chemical Intermediates     Hybrid Journal   (Followers: 3)
Revista Cubana de Química     Open Access  
Revista ION     Open Access  
Revista Mexicana de Ingeniería Química     Open Access  
Russian Chemical Bulletin     Hybrid Journal   (Followers: 3)
Russian Journal of Applied Chemistry     Hybrid Journal  
Solid Fuel Chemistry     Hybrid Journal  
South African Journal of Chemical Engineering     Open Access   (Followers: 3)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 7)
Sustainable Chemical Processes     Open Access   (Followers: 3)
Synthesis Lectures on Chemical Engineering and Biochemical Engineering     Full-text available via subscription  
The Canadian Journal of Chemical Engineering     Hybrid Journal   (Followers: 5)
The Chemical Record     Hybrid Journal   (Followers: 1)
Theoretical Foundations of Chemical Engineering     Hybrid Journal   (Followers: 3)
Transition Metal Chemistry     Hybrid Journal   (Followers: 6)
Transylvanian Review of Systematical and Ecological Research     Open Access  
Upstream Oil and Gas Technology     Open Access   (Followers: 1)
Visegrad Journal on Bioeconomy and Sustainable Development     Open Access   (Followers: 1)

  First | 1 2     

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Polymer Bulletin
Journal Prestige (SJR): 0.443
Citation Impact (citeScore): 2
Number of Followers: 6  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1436-2449 - ISSN (Online) 0170-0839
Published by Springer-Verlag Homepage  [2469 journals]
  • Efficacy of polymeric nanofibrous membranes for proficient wastewater
           treatment

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      Abstract: Membrane technologies have great potential to treat polluted water due to their characteristic features such as high porosity, flexibility and large mechanical strength. The present review summarizes the most elevated development on fabrication and modification of membrane technologies artificially and naturally, emphasizing their advanced progress, challenges and future improvement in water treatment applications. The article compares the proficiency of different membranes made up of natural or artificial polymers for wastewater treatment and discusses their effectiveness for removing dreads, toxic and widespread heavy metal ions. We compare the electrospun technique against other fabrication techniques, such as interfacial polymerization, phase inversion, stretching, blending and track etching for the preparation of membrane and mainly focusing on electrospinning technique for membrane synthesis which exhibits intriguing properties like high specific surface area, high porosity and robust mechanical strength. The roles of both artificial, as well as natural polymers in water purification, have been summarized. The electrospun nanofiber membrane offers a viable and effective means for wastewater treatment. Graphical abstract
      PubDate: 2022-08-14
       
  • Desalination characteristics of new blend membranes based on sulfonated
           polybenzimidazole and sulfonated poly(arylene ether sulfone)

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      Abstract: Abstract In-house synthesized monosulfonated para-polybenzimidazole (s-p-PBI) was blended with commercially available disulfonated poly(arylene ether) sulfone (SPAES; SES0105, Aquafone™). The s-p-PBI was prepared from the polycondensation of 2-sulfoterepthalic acid and 3, 3ʹ-diaminobenzidine. The 1H NMR spectroscopy confirms the formation of benzimidazole protons. Copolymer SPAES behaves as the electron-withdrawing polymer (sulfonic groups), and s-p-PBI as the electron-donating polymer (imidazole groups). The interactions between polymers are examined through Attenuated Total Reflectance-Fourier Transformed Infrared spectroscopy (ATR-FTIR), Thermogravimetric Analysis (TGA), and Scanning Electron Microscopy (SEM). Tensile stress at maximum load of blend membrane containing 80% (w/w) of s-p-PBI and 20% (w/w) of SPAES (AM-AC-80) is 55.59 MPa, whereas pristine s-p-PBI (AM-AC-100) membrane is 45.35 MPa. The blend polymers were stable in boiling water. All the blend membranes were morphologically stable at 1500 ppm of NaOCl solution immersed for 24 h except for pristine s-p-PBI. The blend polymers showed improved tensile strength and stability in NaOCl solutions compared to pristine s-p-PBI. The blend membranes displayed improved salt rejection with decreasing water permeability. The intrinsic parameters for desalination performance were examined to correlate crosslinking with water and salt transport. AM-AC-80 shows a slight improvement in water diffusivity and a four-fold increase in permeability selectivity (water/NaCl) compared to pristine s-p-PBI.
      PubDate: 2022-08-14
       
  • Modification of poly(methyl vinyl ether − alt − maleic
           anhydride) with pregabalin drug active substance via ring opening
           polymerization of anhydride ring in/noncatalyst media

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      Abstract: Abstract Pregabalin is widely used in neurologic diseases such as epilepsy treatments and has a low half − life in the body when taken in tablet form by mixing physically with some matrix. In order to prolong therapeutic effect of pregabalin in system by means of protecting the stability and activity of pregabalin, poly(methyl vinyl ether − alt − maleic anhydride) copolymer is functionalized with pregabalin. For this purpose, it is synthesized 6 copolymer − drug delivery systems which pregabalin drug active material bonded to poly(methyl vinyl ether − alt − maleic anhydride) copolymer in 3 different ratios in uncatalyzed media and in triethylamine catalyst media. The approximate molecular weight of copolymer-drug delivery systems and percent drug binding to copolymer are calculated together with the structural characterization of the synthesized copolymer-drug delivery systems by FT-IR/ATR and 1 H NMR spectroscopy and morphological characterization via SEM, XRD and BET analysis. To determine the optimum conditions in which these copolymer-drug delivery systems are stable, zetasizer measurements such as particle size and zeta potential are made in different pH and artificial body fluids as a function of time at 37 ℃. The optimum conditions at which these copolymer-drug delivery systems maintain their activity are determined by UV–VIS spectrum measurements in different pH and artificial body fluid environments depending on time.
      PubDate: 2022-08-13
       
  • Synthesis and characterization of poly(glycolic acid) (PGA) and its
           graphene oxide hybrids (PGA-GO)

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      Abstract: PGA and PGA-GO hybrids with relatively low graphene oxide (GO) concentrations (0.5–2.5 wt%) were mass synthesized. In the preparation of GO, a modified Hummer’s method was used, and both PGA and PGA-GO followed similar synthesis routes. After forming PGA-GO hybrids, it was demonstrated that the reaction products rendered higher molecular weights as the GO concentration increased. The calorimetric traces showed heterogeneous nucleation and dual crystallization and melting mechanisms, the PGA-GO hybrids having higher melting points than neat PGA. There were no changes in crystal habits in these products, although crystal perfection and crystal thickening depended on the GO concentration. Both effects were associated with the higher melting points of the PGA-GO hybrids. Thermo-gravimetric measurements showed increases in thermal stabilities up to 20% depending on the GO concentration. Isothermal mass crystallization indicated enhancement of crystallization rates and crystal geometry changes from spherical to cylindrical depending on the GO concentration. There were also small clusters and other entities involved in the crystallization process. Graphical abstract
      PubDate: 2022-08-13
       
  • Drug-loaded PCL electrospun nanofibers as anti-pancreatic cancer drug
           delivery systems

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      Abstract: Abstract Cancer is one of the main causes of death worldwide, being pancreatic cancer the second deadliest cancer in Western countries. Surgery, chemotherapy and radiotherapy form the basis of pancreatic cancer’s current treatment. However, these techniques have several disadvantages, such as surgery complications, chemotherapy systemic side effects and cancer recurrence. Drug delivery systems can reduce side effects, increasing the effectivity of the treatment by a controlled release at the targeted tumor cells. In this context, coaxial electrospun fibers can increase the control on the release profile of the drug. The aim of this study was to encapsulate and release different anticancer drugs (5-Fluorouracil and Methotrexate) from a polymeric fiber mat. Different flows and ratios were used to test their effect on fiber morphology, FTIR spectrum, drug encapsulation and release. Good integration of the anticancer drugs was observed and the use of a desiccator for 24 h showed to be a key step to remove solvent remanence. Moreover, the results of this study demonstrated that the polymeric solution could be used to encapsulate and release different drugs to treat cancers. This makes coaxial electrospinning a promising alternative to deliver complex chemotherapies that involve more than one drug, such as FOLFIRINOX, used in pancreatic cancer treatment.
      PubDate: 2022-08-13
       
  • Amelioration of ionic conductivity (303 K) with the supplement of MnO2
           filler in the chitosan biopolymer electrolyte for magnesium batteries

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      Abstract: Abstract In the present work, the significance of adding MnO2 filler towards the development of biopolymer electrolyte and chitosan with enhanced ionic conductivity has been reported. The complexation that has been taken place with the inclusion of MgNO3.6H2O salt and MnO2 filler in the chitosan matrix has been investigated through the Fourier transform infrared (FTIR) spectra analysis. Further, the transport parameter values such as number of charge carrier densities (n), mobility (μ) and diffusion coefficient (D) have been calculated from the deconvoluted FTIR spectra. X-Ray diffraction (XRD) and differential scanning calorimetric (DSC) examination revealed that the inclusion of filler significantly reduced the degree of crystallinity and the glass transition Tg values, respectively. These findings show that the inclusion of filler increases the segmental mobility of the polymer chains, allowing for faster ion transport. The conduction properties of the prepared electrolytes have been determined using alternating current (AC) impedance analysis, with the electrolyte containing 60 wt% magnesium salt (2.6 ± 0.08) × 10−4 S cm−1 achieving the maximum ionic conductivity value at room temperature (303 K). This value is further increased by one order of magnitude with the addition of MnO2 filler into the polymer matrix (1.25 ± 0.09) × 10−3 S cm−1. To elucidate the individual contributions of ions and electrons in the conduction process, the direct current (DC) polarization method has been used to determine the transference number (tion) of the produced electrolytes. The filler-added chitosan polymer exhibits an extended electrochemical stability window, 1.7 V, as determined by linear sweep voltammetry (LSV).
      PubDate: 2022-08-13
       
  • Layered Ag(I) coordination polymer: photocatalytic property and
           therapeutic effects on neonatal pneumonia

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      Abstract: Abstract A new Ag(I) boron imidazolate framework with the chemical formula of {Ag[BH(im)3]}n (1, BH(im)3− = tri(imidazolyl)borate) has been synthesized by the self-assembly of Ag(I) and tridentate boron imidazolate ligand. This compound shows intense luminescence and outstanding photocatalytic activity for the Rhodamine B degradation with an irradiation of ultraviolet. Moreover, the compound’s therapeutic effects on neonatal pneumonia were explored and the corresponding mechanism was tested in meantime. The enzyme linked immunosorbent assay detection was firstly conducted to measure the content of inflammatory cytokines released into the bronchoalveolar lavage fluid. Then, the activation of JNK/MAPK signaling pathway activation in the alveolar epithelial cells was measured with the real-time reverse transcription-polymerase chain reaction. Finally, the cytotoxicity of the complex was determined with Cell Counting Kit (CCK-8) assay.
      PubDate: 2022-08-13
       
  • Two 3D supramolecular complexes: photoluminescent property and therapeutic
           effect with synergistic curcumin on post-stroke depression

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      Abstract: Abstract Coordination polymers have been a hot research topic in the field of biomedicine for their interesting bioactivities. To study the effects of metal ions on the bioactivity of the resulting coordination polymers, in this study, two novel coordination polymers, [Zn4(L)4(bix)4]·n(DMF)·4n(H2O) (1) and [Cd(L)(bix)(H2O)2]n·2n(H2O) (2) (H2L = 5-(1-oxoisoindolin-2-yl)isophthalic acid, bix = 5-(1-oxoisoindolin-2-yl)isophthalic acid, DMF =  N,N′-dimethylformide), have been synthesized by the reactions of H2L, bix and Zn(II) or Cd(II) salts under the solvothermal condition and further characterized via the single crystal X-ray diffraction, powder X-ray diffraction, elemental analysis and thermogravimetric analyses. The CIE chromaticity diagram indicated that complexes 1 and 2 are excellent blue luminescent materials. Their therapeutic effect with synergistic curcumin on post-stroke depression was explored in the present work. First of all, the analysis of enzyme-linked immunosorbent assay was exploited for testing the 5-hydroxytryptamine (5-HT) content exists in brain. Next, the serotonin transporter relative expression was also analyzed with the detection of real-time reverse transcription-polymerase chain reaction (RT-PCR). The experimental results show that the CP 1 could be a better candidate for synergistic curcumin for treating post-stroke depression by increasing 5-HT content and relative expression of serotonin transporter than CP 2.
      PubDate: 2022-08-13
       
  • Experimental assessment of mechanical behavior of
           basalt/graphene/PP-g-MA-reinforced polymer nanocomposites by response
           surface methodology

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      Abstract: Abstract The present study investigates the mechanical and morphological properties of polypropylene (PP)-based nanocomposites reinforced with basalt fiber, graphene nanosheets, and polypropylene-grafted maleic anhydride (PP-g-MA) using Box–Behnken design and response surface methodology (RSM). Using an internal mixer and hot press compression, the reinforcements were added to the matrix at three levels, including 0, 0.75, and 1.5 wt% graphene nanosheets, 0, 7.5, and 15 wt% basalt fiber, and 0, 3, and 6 wt% PP-g-MA. The fiber length was 5 mm and kept fixed for all samples. The samples were subjected to tensile, flexural, and impact tests to obtain the optimum levels of reinforcements. The results of RSM revealed that while the inclusion of graphene nanosheets at 1 wt% improved the tensile, flexural, and impact strength by 15%, 11%, and 16%, respectively, its further inclusion at 1.5 wt% weakened these properties. The incorporation of graphene nanosheets at 1.5 wt% improved the elastic modulus by 69%. Adding basalt fibers to 15 wt% improved the elastic modulus, tensile, flexural, and impact strength by 27%, 85%, 10%, and 8%, respectively. The incorporation of PP-g-MA enhanced the graphene nanosheet/basalt fiber adhesion to the matrix, dispersion, and compatibility, resulting in improved tensile strength and elastic modulus by 18% and 71%, respectively. Based on RSM analysis, adding PP-g-MA to 5 wt% improved the flexural strength by 8% and impact strength by 5% while its further addition to 6 wt% decreased these properties. The samples were also monitored by FE-SEM to assess the dispersion of each of the reinforcements in the polymeric matrix.
      PubDate: 2022-08-12
       
  • Modification and preparation of four natural hydrogels and their
           application in biopharmaceutical delivery

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      Abstract: Abstract Hydrogels possess a unique three-dimensional structure into which many drugs can be incorporated. The hydrogels slow down the release rate of drugs, protect them from external factors and improve their stability. Thus, hydrogels have been widely used in delivering biological products in recent years. The characteristics of natural hydrogel materials are low toxicity, easily accessible and sufficient resources. After modification, natural hydrogels can be more ductile and avoid the defects of brittle quality. Chemical modification of the groups in natural hydrogels improves some of their sensitivity toward pH, temperature and light. Chitosan, hyaluronic acid, gelatin, and sodium alginate are four common natural polymers widely used in medicine and health care. A systematic review of the above four polymer materials is essential for an in-depth understanding of their functions and further development. This review summarizes (1) the characteristics of chitosan, hyaluronic acid, gelatin and sodium alginate these four polymers, (2) their derivatives and mechanisms, (3) the crosslinking mechanisms, and (4) the applications in the delivery of biological products. This review will be a comprehensive resource on these polymers and will be helpful to the researchers who are interested in developing drug delivery systems.
      PubDate: 2022-08-11
       
  • Influence of the content of corn thermoplastic starches (TPS) prepared
           with different plasticizers on the rheological and mechanical properties
           of PCL/TPS blends

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      Abstract: Abstract Preparing blends from fully biodegradable resources is an important alternative in the production of materials less harmful to the environment. Among these materials, thermoplastic cornstarch (TPS) and polycaprolactone (PCL) are an interesting possibility for replacing conventional synthetic materials, and it is desirable that they present relative stability under conditions of processing and use. In the present work, PCL/TPS blends with up to 30% TPS, obtained from cornstarch plasticized with water and glycerin, coconut or babassu oil, were processed in an internal laboratory mixer. Adjusted torque variation rate during the last processing stage is a very sensitive indicator of molar mass alterations with processing time. Rheometry data indicate that TPS obtained with babassu and coconut vegetable oils have a higher molar mass compared to that obtained with glycerin. In addition, the incorporation of TPS promotes thermal degradation in PCL/TPS mixtures, which is more pronounced the higher the TPS content and with TPS-glycerin, except for the PCL/20%TPS blends obtained with glycerin and babassu oil. The mechanical properties of the extruded films decreased with the addition of TPS, this reduction being more evident with the increase in the TPS content and in systems with TPS obtained with babassu oil. In contrast, only in blends containing 10 and 20% TPS of glycerin, there was an increase in elongation at break, being a good feature for flexible films, this property is desirable in certain applications.
      PubDate: 2022-08-11
       
  • The effect of ultrahigh shear rate on the physical characteristics of
           xanthan gum

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      Abstract: Abstract Xanthan gum is an important high polymer for turbulent drag reduction in fluid engineering applications, but the drag reduction characteristics will disappear with ultrahigh rotating shear. To further reveal this phenomenon, the average shear rate is proposed with the energy dissipation theory to explore drag reduction and rheological characteristics of the polymers in an ultrahigh rotating shear experimental system. The results indicate that the shear leads to the mechanical degradation of the polymer, further increasing the ultrahigh shear rate. A higher shear rate accelerates the degradation of the polymer solution and makes it approach Newtonian fluid, decreasing drag reduction characteristics. Besides, it is found that the ideal addition concentration is 3500 ppm, at which the relative degradation degree is globally slightest, and the relative degradation rate is locally smallest. Understanding these characteristics could help select the ideal concentration of polymers and add polymers regularly to maintain the drag reduction efficiency during ultrahigh rotating shear.
      PubDate: 2022-08-11
       
  • Influence of wheat stalk nanocellulose on structural, mechanical, thermal,
           surface and degradation properties of composites with poly(butylene
           adipate-co-terephthalate)

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      Abstract: Abstract Structural, mechanical, thermal and surface properties comprising biodegradable aromatic–aliphatic polymer poly(butylene adipate-co-terephthalate) (PBAT) and the wheat stalk-based nanocellulose (NCC) were studied. The materials were found to comprise the compatible and yet phase-segregated constituents which kept their identity in the nanocomposite materials. The NCC phase was found to be homogeneously dispersed in the PBAT matrix inside. Similar to the corresponding microcomposites, the investigated nanocomposites were found to be stable within their desired application temperature as packaging materials. The tensile properties of the nanocomposites degraded in terms of strain at break, tensile strength and tensile modulus. At higher filler content, the reinforcing effect dominated leading to an increase in indentation modulus and hardness, and a decrease in the work of elastic deformation. The wettability and the water absorption capacity of the materials increased with NCC content thereby enhancing the biodegradability of the composites.
      PubDate: 2022-08-09
       
  • Derivatives of [P4-VP] 2% DVB as corrosion inhibitors for St-37 in 1 M
           H2SO4: an experimental and theoretical investigations

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      Abstract: Abstract Poly (4-vinyl pyridine) cross-linked by 2%DVB quartenized by I−, Br−, N3− and SCN−; named [P4-VP]MI, [P4-VP]BBr, [P4-VP]MN3, [P4-VP]MSCN are synthesized and their effect as a new eco-friendly polymeric inhibitor on the corrosion process of St-37 in 1 M H2SO4 at ambient temperature was investigated. Fourier-transform infrared spectroscopy (FT-IR), energy dispersive X-ray (EDX) and scanning electron microscope (SEM) techniques are used to confirm formation and the structure of the inhibitors. Then, their ability as corrosion inhibitors are examined by theoretical computation as well as the experimental tests involving potentiodynamic polarization (PDP), weight-loss measurements and electrochemical impedance spectroscopy (EIS). According to the obtained results, all inhibitors can effectively protect carbon steel from corrosion and the inhibition efficiency increases as the concentration of inhibitor and reaching 91.08% at 0.04 g L−1 [P4-VP]MI in 1 M H2SO4 and the corrosion current density reduces from 398.11 × 10−6 A·cm−2 in the blank condition to 35.48 × 10−6 A·cm−2. The geometrical and electronic properties of poly(4-vinylpyridine) cross-linked with 2% divinyl benzene and its derivatives as well as their corrosion inhibition process on Fe (1 1 0) surface are investigated using density-functional theory (DFT) and molecular dynamics (MD) simulation in water solution. The results of comparing the inhibitory efficiency of polymers show that the order of inhibition is as follows: [P4-VP]MI > [P4-VP]BBr > [P4-VP]MN3 > P4-VP > [P4-VP]MSCN.
      PubDate: 2022-08-09
       
  • Plant-mediated synthesis of iron oxide nanoparticles/ polyvinyl alcohol
           nanocomposite and exploring their potential adsorption properties against
           selected heavy metals

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      Abstract: Abstract The current work is based upon an eco-friendly method to fabricate both pure and manganese doped iron oxide nanoparticles along with nanocomposites with polyvinyl alcohol using Indigofera Heterantha plant extract. Synthesis of iron oxide nanoparticles is confirmed successfully by UV–visible spectroscopy. The presence of coating materials, crystallinity and morphology was investigated via FTIR, XRD spectra and TEM. The prepared iron oxide, both pure and doped with Mn, along with their nanocomposites is employed for the uptake of chromium (VI) and lead (II) from its solutions successfully. Different parameters like concentration, contact time and pH of the media were analyzed for their possible effect on the efficiency of adsorbent. Maximum adsorption achieved at pH 3 and 5 for Cr (VI) and Pb (II) ions, respectively. Under preplanned conditions the maximum efficiency (Qmax) of IONPs nanoparticles-based absorbent was 84% (Lead) and 92% (chromium) and equilibrium achieved within 20 min. Obtained data revealed that the adsorption of both Cr (VI) and Pb (II) ions on used adsorbent followed pseudo-second-order kinetics. Contrary to kinetics Cr ions adsorption is described by Freundlich isotherm while lead by Langmuir. The sorption model parameter demonstrates that the synthesized materials can be utilized as an excellent economical nano-adsorbent for the removal of Pb (II) and Cr (VI) from water.
      PubDate: 2022-08-08
       
  • Eugenol: extraction, properties and its applications on incorporation with
           polymers and resins—a review

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      Abstract: The inclination of industry towards the naturally extracted raw materials is increasing to ensure the replacement of petroleum-based raw materials. “Eugenol” is a naturally extracted compound that serves as an efficient raw material for various polymers. It is the chemical structure of eugenol that enables it to get functionalized thereby making it potential for incorporation in polymers. The presence of aromatic ring and allyl group ensures the stability and resistivity against the factors which are favourable to the microbial colonization over the surface of the product. This enables the polymers incorporated with eugenol to impart better barrier properties to the product thereby enhancing its shelf life. Thus, it was applied in the polymer, coating as well as in the packaging industry. The study deals with the extraction, properties, and application of eugenol as raw material, in the packaging and the coating industry. Various extraction methods of eugenol have been discussed as conventional, non-conventional, and green technology. It is obtained naturally from plants such as tulsi leaves, clove buds, cinnamon bark, and turmeric. Several properties of eugenol such as solubility, toxicity, antimicrobial, and antifungal properties are discussed. The discussion of the incorporation of Eugenol with various polymers such as polyesters, polyurethanes, polyacrylates, epoxy, polyolefins and subsequent improvements in their properties has been discussed. It was also incorporated with oils and certain biopolymers like starch and cellulose. Eugenol used as an additive and its various properties in each application are discussed. Graphical abstract
      PubDate: 2022-08-08
       
  • A concise review on bio-responsive polymers in targeted drug delivery
           system

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      Abstract: Bio-responsive polymers are the cornerstone of the creation of keen structures which, after getting unique stimuli like biotic indications as well as pathological irregularities, exhibit engineered biomedical functions. The creation of innovative products in precision medicine (a type of medicine that uses a person’s own gene or protein knowledge to prevent, diagnose, or treat illness) has shown considerable promise in these stimulus-receptive schemes, and in recent years, there has been a lot of research on this topic. The goal of this analysis is to summaries the introductory consciousness and recent development of advanced bio-responsive technologies like in recent years, bio-responsive polymeric nanotherapeutics have emerged as an intriguing medium for safe and effective cancer treatment to promote tumor cell uptake and cause drug delivery at the target location. However, the bio-responsive polymer-based drug delivery system may suffer from drawbacks like the polymers may have safety issues and sometimes the stimuli fail to release the drugs incorporated into the systems resulting failure of the system. So, more research is needed to explore on the behavior of different bio-responsive polymers for development of strategic drug transport arrangement. In this article, we have focused on numerous bio-approachable polymers used for development of pH, temperature, magnetic field, light, sound responsive drug delivery system. Graphical abstract Biological stimuli-sensitive polymeric drug delivery system
      PubDate: 2022-08-07
       
  • Effect of UV-illumination on refractive index of PMMA/metal oxide
           nanocomposite films

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      Abstract: Abstract Metal oxide nanoparticles (MONPs) (ZnO, TiO2, SiO2, and CuO NPs) were synthesized with an average size of around 50 nm. The synthesized MONPs were incorporated into Poly(methyl methacrylate) (PMMA) matrix deposited on glass substrate led to form PMMA/MONPs nanocomposite films. Fourier-Transform Infrared (FTIR) spectroscopy was employed to investigate the vibrational bands of pure PMMA and the incorporated PMMA/MONPs nanocomposite films. SEM micrographs showed the amorphous morphology of PMMA/MONPs nanocomposite films indicating the excellent dispersion of the MONPs on the surface. PMMA and PMMA/MONPs were exposed to the UV light for a period of 1, 3, and 5 min to investigate the impact on their refractive index (n). The UV-light exposure led to cause an increase in the refractive index of the PMMA in the visible region and decrease in the UV region and the opposite way around in the PMMA/MONPs nanocomposite films. Applying Maxwell–Garnett and Bruggeman's effective medium approximation models to investigate the distribution of the MONPs in the PMMA matrix shows a transfer from continuous aggregated nanoparticles to spherical or ellipsoidal distribution.
      PubDate: 2022-08-07
       
  • Dissolvable zinc oxide nanoparticle-loaded wound dressing with
           preferential exudate absorption and hemostatic features

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      Abstract: Abstract A major challenge in treating burn wounds is bacteria invasion which prolongs the wound healing process. Most of the available wound dressings used to treat burn wounds can cause further skin tears upon removal. Due to this limitation, there is a need to design wound dressings that can be easily removed without causing skin tears with desirable antibacterial activity and absorption capability. Dissolvable wound dressings were prepared from a combination of sodium alginate and Poloxamer-407. B02, B08, and B13 loaded with a combination of ZnO NPs and ciprofloxacin or ciprofloxacin alone exhibit promising antibacterial activity against Enterococcus faecalis, Staphylococcus aureus, Proteus mirabilis, Echerischia coli, and Klebsiella aeruginosa. Most of the wound dressings displayed excellent porosity with a rapid uptake of the simulated wound exudate in the range of 870–4468% followed by dissolution. Haemostasis evaluation on the wound dressings reveal low absorbance values of 0.2511 (p-value = 0.0094), 0.2066 (p-value = 0.0002) for B02 and B03 compared to the control (whole blood) suggesting ideal clotting capability. The exceptional features of the prepared wound dressings reveal their potential use for the management of burn wounds on sensitive skin.
      PubDate: 2022-08-06
       
  • A new heterometallic compound for the detection of acetylacetone and
           prevention activity on osteoarthritis

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      Abstract: Abstract A new inorganic-organic hybrid heterometallic compound, namely {[(CH3)2NH2][CdNa(4,4′-bpdc)2]}n·6n(H2O) (1, 4,4′-H2bpdc is 4,4′-biphenyldicarboxylic acid), was synthesized through the solvothermal self-assembly reactions of 4,4′-H2bpdc ligand in combination with Cd(II) and Na(I) salts. importantly, compound 1 shows high selectivity and sensitivity for the detection of acetylacetone (Hacac) molecule with a high Ksv value of 11.667 nM−1. Its prevention activity on osteoarthritis after the reconstruction of anterior cruciate ligament was investigated and the associated mechanism was analyzed. At first, the enzyme linked immunosorbent assay (ELISA) detection was implemented in the current research to detect the Interleukin-1β (IL-1β) and Interleukin-1β (IL-18) content released into joint cavity after treated with the compound. The results showed that this complex was good at inhibiting the IL-1β and IL-18 content released into joint cavity. The real time reverse transcription-polymerase chain reaction (RT-PCR) was carried out and the nuclear factor kappa-B (NF-κB) signaling pathway activation in joint soft tissue was tested exploiting real time RT-PCR. The real time RT-PCR exhibited that the NF-κB signaling pathway activation in the joint soft tissue was significantly reduced by the new compound. Subsequently, the levels of cartilage tissue cell apoptosis were also tested through Annexin V-FITC Apoptosis detection, and the results suggested the cartilage tissue cell apoptosis levels were obviously reduced by the compound.
      PubDate: 2022-08-06
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
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